api: grpc: add Limit to PidsStats

This will be filled by the value of pids.max, allowing clients to render
usage statistics for PIDs in a container.

Signed-off-by: Aleksa Sarai <asarai@suse.de>

api/grpc/server/server_linux.go

@@ -164,6 +164,7 @@ func convertToPb(st *runtime.Stat) *types.StatsResponse {
 	}
 	pbSt.CgroupStats.PidsStats = &types.PidsStats{
 		Current: lcSt.CgroupStats.PidsStats.Current,
+		Limit:   lcSt.CgroupStats.PidsStats.Limit,
 	}
 	return pbSt
 }